Hai Zao is a brown macroalga (Sargassum species) traditionally valued in TCM for resolving phlegm, softening hardness, and reducing goiter through its exceptional iodine and mineral content. Its viscous polysaccharides and trace elements make it particularly potent for addressing thyroid imbalances and stubborn nodular masses.
whole thallus, frond
decoction, powder, tea, capsule
6–12g dried thallus in decoction daily; 3–9g powder in capsules twice daily
High in iodine — monitor thyroid. Avoid in hyperthyroidism.
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